Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA20064RUNNER SR5, 4.7 T, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEMSFI SYSTEM (1GR-FE)ON-VEHICLE INSPECTION

2006 Toyota 4Runner SR5, 4.7 T, AWD

On-Vehicle Inspection

2006 Toyota 4Runner SR5, 4.7 T, AWDSECTION On-Vehicle Inspection

INSPECTION MASS AIR FLOW METER
1. If you have the hand-held tester:
  Inspect operation
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Blow air into the MAF meter, and check that the air flow value of the CURRENT DATA changes.
    If operation is not as specified, check the MAF meter (See INSPECTION ) as well as the wiring and the ECM.
    
    Fig 1: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If you do not have the hand-held tester:
  Inspect operation
  1. Turn the ignition switch ON.
  2. Connect the positive tester probe of the voltmeter to the terminal VG of the ECM and the negative tester probe of the voltmeter to the terminal E2G of the ECM.
  3. Blow air into the air flow meter, and check if the voltage fluctuates.
    
    Fig 2: Connecting Positive Tester Probe Of Voltmeter To Terminal VG Of ECM
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If operation is not as specified, check the MAF meter (See INSPECTION ), the wiring and the ECM.
    
    Fig 3: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK MASS AIR FLOW METER (MAF meter)
NOTE:
- Perform the MAF meter inspection by following the procedures below.
- Only replace the MAF meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.
1. Perform confirmation driving pattern.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Turn the tester on.
  4. Clear the DTCs (see DTC CHECK/CLEAR ).
  5. Start the engine and warm it up with all accessory switches off (until the engine coolant temperature is 75°C (167°F) or more).
  6. Drive the vehicle at 31 mph (50 km/h) or more for 3 to 5 minutes.
  7. Allow the engine to idle for 2 minutes.
  8. Perform steps 6 and 7 at least 3 times.
    
    Fig 4: Identifying Blinking Pattern
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Read value using the hand-held tester (LONG FT#1).
  1. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / LONG FT#1.
  2. Read the values displayed on the tester.
    Standard value:
    
    Within -15 to +15%
    
    If the result is not within the specified range, perform the inspection below.
3. Read value using the hand-held tester (MAF).
  NOTE:
  - Turn off the engine.
  - Perform the inspection with the vehicle indoors and on a level surface.
  - Perform the inspection of the MAF meter while it is installed to the air cleaner case (installed to the vehicle).
  - During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.
  1. Turn off the engine (do not run the engine).
  2. Turn the ignition switch ON.
  3. Turn the tester on.
  4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / PRIMARY / MAF.
  5. Wait 30 seconds, and read the values on the hand-held tester.
    Standard condition:
    
    Less than 0.27 g/s
    - If the result is not as specified, replace the MAF meter.
    - If the result is within the specified range, inspect the cause of the extremely rich or lean air fuel ratio (see DTC P0171 SYSTEM TOO LEAN (BANK 1); DTC P0172 SYSTEM TOO RICH (BANK 1); DTC P0174 SYSTEM TOO LEAN (BANK 2); DTC P0175 SYSTEM TOO RICH (BANK 2) ).
      
      Fig 5: Inspecting Throttle Body
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECTION THROTTLE BODY
1. Check for operating sound.
  1. Turn the ignition switch ON.
  2. When turning the accelerator pedal position sensor lever, listen to a running sound of the motor. Also, check that there is no friction sound.
    If operation is not as specified, check the throttle control motor (See INSPECTION ), wiring and ECM.
2. Inspect the throttle position sensor.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. When turning the accelerator pedal position sensor lever to the full-open position, check that the percentage of throttle valve opening angle (THROTTLE POS) of the CURRENT DATA.
    Standard percentage of the valve opening angle: 60% or more
    
    If operation is not as specified, check that the accelerator pedal position sensor, the wiring and the ECM.
    
    If you do not have the hand-held tester, measure voltage between the terminals (VTA1 - E2, VTA2 - E2) of the ECM connector (See TERMINALS OF ECM ).
3. Inspect the air assist system.
  1. Start the engine and check that the MIL does not illuminate.
  2. Let the engine warm up to the normal operating temperature.
  3. Switch the A/C compressor from ON to OFF, and check the idle speed.
    Idle speed (Transmission in neutral): 700 +/- 50 rpm
    
    NOTE: Perform inspection under condition without electrical load.
4. After checking the above ( b) to ( d), perform the driving test.
INSPECT ACCELERATOR PEDAL POSITION SENSOR
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Check if the voltage (ACCEL POS) of the CURRENT DATA indicates the standard value.
  Accelerator pedal released: 0.5 - 1.1 V
  
  Accelerator pedal depress: 2.6 - 4.5 V
4. Check if the voltage (ACCEL POS #2) of the CURRENT DATA indicates the standard value.
  Accelerator pedal released: 1.2 - 2.0 V
  
  Accelerator pedal depress: 3.4 - 5.3 V
  
  If you do not have the hand-held tester, measure voltage between terminals (VPA - EPA, VPA2 - EPA2) of the ECM connector (See TERMINALS OF ECM ).
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Start the engine and warmed it up.
4. Connect the hand-held tester and select the VVT from the ACTIVE TEST menu.
5. Check the engine speed when the OCV is operated by the hand-held tester.
  Standard:
  
  VVT system is OFF (OCV is OFF): Normal engine speed
  
  VVT system in ON (OCV is ON): Rough idle or engine stalled

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.